| cardiac cycle |
a complete cardiac movement or heart beat. The period from the beginning of one heart beat to the beginning of the next; the systolic and diastolic movement, with the interval between them. See also accompanying illustration.
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| cardiac murmur |
a sound of finite length generated by turbulence of blood flow through the heart; often classified as systolic, diastolic, or continuous, and further divided on the basis of its timing within systole or diastole. Murmurs are graded from 1 to 6 on the basis of increasing loudness.
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| cardiac polyp |
a ball thrombus or tumor attached by a pedicle to the inside of the heart.
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| cardiac pacemaker |
the group of cells rhythmically initiating the heart beat, characterized physiologically by a slow loss of membrane potential during diastole. Usually the pacemaker site is the sinoatrial node. See also artificial cardiac p.
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| cardiac pacing |
regulation of the rate of contraction of the heart muscle by an artificial cardiac pacemaker.
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